Conciseness

The body is short but restates the same sprite/HTTP-request fact three times (intro sentence, 'Quick Reference' bullets, and 'Explain'), content Claude already knows. It is not a 2 because there is no library-style padding, and not a 4 because the Quick Reference and Explain sections add little beyond the intro.

Actionability

'Check if small images and icons are combined into sprites' and 'Create CSS sprites for icons and small images, or migrate to SVG icons' state concrete intent, but the body itself contains no executable examples or specific commands — the concrete CSS sprite code lives only in references/rule.md. Guidance is directionally useful yet incomplete as written.

Workflow Clarity

For a simple single-purpose review skill, the Check → Fix → Explain → Code Review sequence is clear and unambiguous, satisfying the simple-skill path. It falls short of 5 because the 'Code Review' section partially re-covers 'Check' and no step verifies findings (e.g., confirming the request count in DevTools as the section itself hints at).

Progressive Disclosure

The body is under 50 lines with well-organized sections and a single clearly signaled, one-level-deep reference ('For full implementation details, code examples, and framework-specific guidance, see references/rule.md') that exists as a real file. This matches the anchor for a clear overview with an appropriately split reference.

Specificity

The description lists several concrete actions — 'reviewing image assets, markup, and CDN or build transforms' and 'Check encoded size, rendered size, loading strategy, and above-the-fold impact together' — with only minor coverage gaps. It falls short of a 5 because the embedded rule title 'related to Use image sprites where appropriate' reads as a pasted label rather than a stated capability.

Completeness

Both parts are present: an explicit trigger ('Use when reviewing image assets, markup, and CDN or build transforms') and a concrete what ('Check encoded size, rendered size, loading strategy, and above-the-fold impact together'). It is not a 5 because the 'when' lacks natural trigger phrases and the what is checklist-style rather than fully explicit.

Trigger Term Quality

Relevant keywords exist ('image assets', 'CDN', 'loading strategy', 'above-the-fold'), but the most natural trigger terms users would say — 'sprite', 'sprites', 'SVG icons', 'icon font' — appear only awkwardly inside the clause 'related to Use image sprites where appropriate'. Common variations and synonyms are largely missing.

Distinctiveness Conflict Risk

The sprite/above-the-fold niche is mostly distinct, but the check dimensions (encoded size, loading strategy, rendered size) overlap with other frontend image rules (lazy loading, responsive images, format choice), creating minor conflict risk with closely related skills.